To calculate the number of moles from molarity and volume, you can use the formula:
moles = molarity × volume
In this formula, ‘molarity’ is expressed in moles per liter (mol/L) and ‘volume’ should be in liters (L). This means if you have the volume in milliliters (mL), you need to convert it to liters by dividing by 1000 (since 1000 mL = 1 L).
For example, if you have a solution that is 2 M (2 moles per liter) and you are using 500 mL of that solution, first convert the volume to liters:
500 mL ÷ 1000 = 0.5 L
Now, apply the formula:
moles = 2 mol/L × 0.5 L = 1 mole
So, in this example, you have 1 mole of solute in the 500 mL of the 2 M solution.